Which part of the brain controls shivering?

sarcomere

Components of sarcomere

Stages of sliding filament theory.*****

1) first, tropomyosin covers an active site on the actin preventing the myosin head from binding
2) second, in presence of calcium ions, troponin pulls the tropomyosin back, exposing the active site and thus allowing the myosin to bind
3) power stroke
4) ATP attaches to the myosin head
5) ATP splits to inorganic phosphate and ADP

Two qualifiers for muscles to contract

Power stroke

Role of action potential in muscle contraction

AP initiates muscle contraction. AP of the neuron releases Ach in the neuromuscular synapse. The Ach activates ion channels in the sarcolemma of the muscle cell creating an AP. AP travels via T-tubules to the sarcoplasmic reticulum, which increases its permeability to calcium. At the end of each cycle, calcium is actively pumped back into the sarcoplasmic reticulum.